CIRRUS PA96

PA96
PA96
P r o d uPA96
c t IInnnnoovvaa t i o n FFr roomm
Power Operational Amplifier
FEATURES
• HIGH VOLTAGE - 300 VOLTS
• HIGH OUTPUT CURRENT – 1.5 AMPS
• 70 WATT DISSIPATION CAPABILITY
• 175 MHz GAIN BANDWIDTH
• 250 V/µ-SECOND SLEW RATE
APPLICATIONS
• PZT DRIVE
• MAGNETIC DEFLECTION
• PROGRAMMABLE POWER SUPPLIES
• 70V LINE AUDIO to 70W
TYPICAL APPLICATION
RF
RI
DESCRIPTION
The PA96 is a state of the art high voltage, high current
operational amplifier designed to drive resistive, capacitive
and inductive loads. For optimum linearity, the output stage
is biased for class A/B operation. External compensation
provides user flexibility in maximizing bandwidth at any gain
setting. The safe operating area (SOA) can be observed for
all operating conditions by selection of user programmable
current limit. For continuous operation under load, a heatsink
of proper rating is required.
The hybrid integrated circuit utilizes thick film (cermet)
resistors, ceramic capacitors and semiconductor chips to
maximize reliability, minimize size and give top performance.
Ultrasonically bonded aluminum wires provide reliable interconnections at all operating temperatures. The 8-pin TO-3
package is hermetically sealed and electrically isolated. The
use of compressible isolation washers voids the warranty.
EQUIVALENT CIRCUIT DIAGRAM
+Vs 3
8-pin TO-3
PACKAGE STYLE CE
+275V
+
_
-
PA96
+
-15V
CC
PZT POSITION CONTROL
The MOSFET output stage of the PA96 provides superior
SOA performance compared to bipolar output stages where
secondary breakdown is a concern. The extended SOA is
ideal in applications where the load is highly reactive and
may impose simultaneously both high voltage and high current across the output stage transistors. In the figure above
a piezo-electric transducer is driven to high currents and high
voltages by the PA96.
EXTERNAL CONNECTIONS
+VS
CL
3
2
RCL
+IN 4
-IN 5
7
+IN 4
1
OUT
TOP VIEW
8
COMP
COMP
-IN 5
RCL
1 OUT
7
-VS 6
COMP
8
COMP
CC
2 CL
-Vs 6
PA96U
http://www.cirrus.com
Copyright © Cirrus Logic, Inc. 2009
(All Rights Reserved)
MAY 20091
APEX − PA96UREVE
PA96
P r o d u c t I n n o v a t i o nF r o m
ABSOLUTE MAXIMUM RATINGS
SUPPLY VOLTAGE, +VS to −VS
OUTPUT CURRENT, continuous
POWER DISSIPATION, internal, DC
INPUT VOLTAGE, common mode
INPUT VOLTAGE, differential
TEMPERATURE, pin solder, 10s
TEMPERATURE, junction1
TEMPERATURE RANGE, storage
OPERATING TEMPERATURE, case
300V
1.5A,
70W
+VS to −VS
±15V
300°C
150°C
−65 to 150°C
−55 to 125°C
SPECIFICATIONS
PARAMETER
TEST CONDITIONS2
INPUT
OFFSET VOLTAGE
OFFSET VOLTAGE vs. temperature
OFFSET VOLTAGE vs. supply
BIAS CURRENT, initial
BIAS CURRENT vs. supply
OFFSET CURRENT, initial
INPUT RESISTANCE, DC
INPUT CAPACITANCE
COMMON MODE VOLTAGE RANGE3
COMMON MODE VOLTAGE RANGE3
COMMON MODE REJECTION, DC
NOISE
GAIN
OPEN LOOP @ 15Hz
GAIN BANDWIDTH PRODUCT @ 1MHz
PHASE MARGIN
PBW
OUTPUT
VOLTAGE SWING3
VOLTAGE SWING3
VOLTAGE SWING3
VOLTAGE SWING3
CURRENT, continuous, DC
SLEW RATE
SETTLING TIME, to 0.1%
RESISTANCE, open loop
THERMAL
RESISTANCE, AC Junction to Case4
RESISTANCE, DC Junction to Case
RESISTANCE, Junction to Ambient
TEMPERATURE RANGE, case
POWER SUPPLY
VOLTAGE
CURRENT, Quiescent total
CURRENT, Quiescent output stage only
MIN
Full temperature range
TYP
MAX
UNITS
1
20
6
5
50
20
200
0.1
50
mV
µV/°C
µV/V
pA
pA/V
pA
GΩ
pF
V
V
dB
µV RMS
114
175
dB
MHz
°
KHz
250
V
V
V
V
A
V/µS
2
7
10
µS
Ω
1.2
1.6
30
1.3
1.8
85
°C/W
°C/W
°C/W
°C
±100
30
10
±150
35
V
mA
mA
100
4
+VS − 13
−VS + 13
92
100KHz bandwidth, 1kΩ Rs
RL= 1kΩ, CC=100pF
VS = 150V, -VS = 150V,
A = -100, RF = 100K
Full temperature range, using
recommended CC for gain.
250V p-p output, 100Ω,
+150V Supplies, Cc = 0pf
IO = 1.5A
IO = −1.5A
IO = 0.1A
IO = −0.1A
AV = −100, ±150V Supplies, 250Ω load
negative slope, Positiveslope much
faster
AV = −100, 1V Step, CC = 0pF
DC, 1A Load
96
100
60
100
+VS − 12
−VS + 12
+VS − 8
−VS + 8
1.5
200
Full temperature range. f > 60Hz
Full temperature range. f < 60Hz
Meets full range specifications
+VS − 5.6
−VS + 10
-25
±15
25
NOTES: 1. Long term operation at the maximum junction temperature will result in reduced product life. Derate power dissipation to achieve
high MTTF.
2. The power supply voltage specified under typical (TYP) applies unless noted as a test condition.
3. +VS and –VS denote the positive and negative supply rail respectively. Total VS is measured from +VS to –VS.
4. Rating applies if the output current alternates between both output transistors at a rate faster than 60Hz.
CAUTION
2
The internal substrate contains beryllia (BeO). Do not break the seal. If accidentally broken, do not crush, machine, or
subject to temperatures in excess of 850°C to avoid generating toxic fumes.
PA96U
PA96
P r o d u c t I n n o v a t i o nF r o m
OPEN LOOP FREQUENCY RESPONSE
OPEN LOOP PHASE RESPONSE
90
120
0
0pF
40
-90
-40
10 100 1K 10K 100K 1M 10M100M
FREQUENCY, (Hz)
50
-50
-150
0
5
10
15
TIME, (µsec)
20
+VS = 150V
-VS = 150V
6 A = -100
CC = 0
2
-2
-6
-10
25
OUTPUT VOLTAGE SWING
0
5
10
15
TIME, (µsec)
20
9
6
VS - VO
3
1.5
1
.5
0
-.5
-1
-1.5
2.0
QUIESCENT CURRENT vs. POWER SUPPLY
QUIESCENT CURRENT, mA
31.0
30.9
30.8
30.7
30.6
30.5
30.4
30.3
30.2
30.1
30.0
30
PA96U
-2.5
30
90
150
210
270
POWER SUPPLY RAIL to RAIL
INTERNAL POWER DISSIPATION, W
0.4
0.8
1.2
1.6
OUTPUT CURRENT, A
0
0
100
20 40 60 80 100 120 140 160
+VS VOLTAGE
LARGE SIGNAL PULSE RESPONSE
+VS = 150V
-VS = 150V
75 A =
-100
CC = 0
25
-25
-75
-120
DC OFFSET vs. POWER SUPPLY
-2
0
0.0
40
20
0
5
10
15
TIME, (µsec)
45
40
35
30
25
20
15
10
5
0
-55 -35 -15 5 25 45 65 85 105 125
TEMPERATURE, °C
SOA
POWER DERATING
80
70
60
50
40
30
20
10
0
-55 -35 -15 5 25 45 65 85 105 125
CASE TEMPERATURE, °C
25
50
90
150
210
270
POWER SUPPLY, RAIL to RAIL
90
20
QUIESCENT CURRENT vs. TEMP.
QUIESCENT CURRENT, mA
VO - (-VS)
60
2.5
DC OFFSET RTI, mV
VS - VO, (V)
12
80
125
25
2
-VS = -15V
120
100
10
OUTPUT VOLTAGE, VO (V)
OUTPUT VOLTAGE, VO (V)
+VS = 150V
-VS = 150V
150 A = -100
CC = 0
140
SMALL SIGNAL PULSE RESPONSE
250
15
0pF
-360
10 100 1K 10K 100K 1M 10M100M
FREQUENCY, (Hz)
RAIL TO RAIL PULSE RESPONSE
-250
22pF
330pF
-180
-270
0
330pF
-VS = -150V
160
OUTPUT VOLTAGE, VO (V)
330pF
22pF
180
OUTPUT CURRENT FROM +VS or –VS (A)
GAIN, db
80
22pF
PHASE, Ф (°)
0pF
GAIN BANDWIDTH vs. +SUPPLY VOLTAGE
200
GAIN BANDWIDTH PRODUCT @ 1MHz
160
3
2
1
.5
.4
.3
.2
st
st
st
ea
ea
dy
st
at
e
T
ea
dy
T
C
dy
st
st
e
T
C
=
e
s
T
C
=
85
=
°C
12
10
0m
at
at
=
25
°C
5°
C
.1
10
20 30 4050
100
200 300
SUPPLY TO OUTPUT DIFFERENTIAL VOLTAGE, VS –VO (V)
3
PA96
P r o d u c t I n n o v a t i o nF r o m
GENERAL
COMPENSATION TABLE
Please read Application Note 1 “General Operating Considerations” which covers stability, supplies, heat sinking,
mounting, current limit, SOA interpretation, and specification
interpretation. Visit www.Cirrus.com for design tools that help
automate tasks such as calculations for stability, internal power
dissipation, current limit, heat sink selection, Apex Precision
Power’s Application Notes library, Technical Seminar Workbook,
and Evaluation Kits.
The following table tabulates recommended compensation
capacitor values vs. gain. These values will typically result in
less than 2% overshoot and a -3db small signal bandwidth of
greater than 1MHz, except under operating conditions where
uncompensated gain bandwidth is too low to support a 1MHz
bandwidth. (See gain bandwidth vs. Plus power supply curves).
Note that other factors such as capacitance in parallel with
the feedback resistor may reduce circuit bandwidth from that
determined from the gain bandwidth curve.
SPECIAL PRECAUTIONS
The PA96 operates with up 300V rail to rail voltage, and
delivers amperes of current. Precautions should be taken for
the safety of the user and the amplifier.
Although the non-operating common mode input range is rail
to rail, the differential input voltage must not exceed ±15 V.
Therefore; if the feedback ratio is less than 10, even if
caused by disconnecting a signal source , typical power turn
on transients can destroy the amplifier.
Similarly in a voltage follower application a large differential
transient can be generated if the slew rate of the input is greater
than that of the voltage follower.
Therefore it is prudent to clamp the input with series back
to back diodes as shown below.
1N4148
1N4148
1N4148
1N4148
PA96
If experimentally optimizing the compensation capacitor,
turn off the supplies and let them bleed to low voltage before
installing each new value. Otherwise internal current pulses of
up to 3 amps can be induced. Also, do you want your fingers
around 300V?
Essentially the full rail to rail power supply voltage may be
applied to the compensation capacitor. A 400V COG or Mica
capacitor is recommended.
POWER BANDWIDTH
The power bandwidth is 1/(π x the negative edge slew time).
The slew time is determined by the compensation capacitor,
load, and internal device capacitance; it is independent of
closed loop gain. The uncompensated power bandwidth is
typically 100kHz for a 250Vp-p output signal into 100Ω. It typically increases to above 300KHz with no load.
4
Cc
150pf
51pf
33pf
22pf
10pf
5pf
None
Cc
330 pf
150pf
51pf
33pf
22pf
10pf
5pf
None
Inverting Gain
From
To
1
2
2
5
5
10
10
20
20
50
50
100
100
up
Non-Inverting Gain
From
To
1
2
2
3
3
6
6
10
10
20
20
50
50
100
100
up
CURRENT LIMIT
For proper operation the current limit resistor, Rcl, must
be connected as shown in the external connections diagram.
The minimum value is 0.2Ω, with a maximum practical value
of 100Ω. For optimum reliability the resistor should be set as
high as possible. The value is calculated as IL = 0.68V/Rcl. Note
that the 0.68V is reduced by 2mV every °C rise in temperature.
Also note that the current limit can be set such that the SOA
is exceeded on a continuous basis. As an example if the current
limit was set at 1.5A and the supply was at 150V, a short to
ground would produce 225 watts internal dissipation, greatly
exceeding the 83 watt steady state SOA rating.
Under some conditions of load and compensation the amplifier may oscillate at a low level when current limit is active,
even though the amplifier is stable otherwise. The current
will be limited to the programmed value in this situation. To
minimize such occurrences, use a non-reactive resistor to
program current limit.
PA96U
P r o d u c t I n n o v a t i o nF r o m
PA96
Contacting Cirrus Logic Support
For all Apex Precision Power product questions and inquiries, call toll free 800-546-2739 in North America.
For inquiries via email, please contact [email protected]
International customers can also request support by contacting their local Cirrus Logic Sales Representative.
To find the one nearest to you, go to www.cirrus.com
IMPORTANT NOTICE
Cirrus Logic, Inc. and its subsidiaries ("Cirrus") believe that the information contained in this document is accurate and reliable. However, the information is subject
to change without notice and is provided "AS IS" without warranty of any kind (express or implied). Customers are advised to obtain the latest version of relevant
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does not extend to other copying such as copying for general distribution, advertising or promotional purposes, or for creating any work for resale.
CERTAIN APPLICATIONS USING SEMICONDUCTOR PRODUCTS MAY INVOLVE POTENTIAL RISKS OF DEATH, PERSONAL INJURY, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE (“CRITICAL APPLICATIONS”). CIRRUS PRODUCTS ARE NOT DESIGNED, AUTHORIZED OR WARRANTED TO BE
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PA96U
5